Maybe wasps? I don’t know that they can actually fly backwards for long, but they can definitely go backwards. I’ve observed them when they were aggressively trying to get at my soda, for example. They fly from side to side until they land where they want to. If you shoo them away, they make this sort of weird quick backwards loop, by flying backwards and then they bounce all the way back to where they were, kind of like as if they were attached to the soda can by an invisible rubber band. Fuckin yoyos.